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8-1 2
STARTING MOTOR-REDUCTION
GEAR
(21) Pull the shifting fork forward and remove the
(22) Remove the shifting fork retainer pin (Fig. 13)
solenoid moving core (Fig. 1 2 ) .
and remove the clutch shifting fork assembly.
CLEANING THE STARTER PARTS
(1)
Do
not immerse the parts in a cleaning solvent.
Immersing the field frame and coil assembly and/or
armature will damage the insulation. Wipe these parts
with
a clean cloth
only.
(2) Do not immerse the clutch unit in a cleaning
solvent. The clutch is pre-lubricated at the factory
and solvent will wash the lubricant from the clutch.
(3) The starter-clutch outer housing and pinion
gear may be cleaned with a cloth moistened with a
cleaning solvent and wiped dry with a clean dry cloth.
(4) Unsolder the solenoid lead wires from the sole-
noid terminal relay stud.
(5) Clean all corrosion from the solenoid assembly
(washers, sleeve and retainer and inside of the sole-
noid housing). These metal parts are part of the sole-
noid hold-in ground circuit and must be clean.
(6) Clean the terminal contacts and contactor with
crocus cloth.
(7)
Thoroughly clean the outside area of the brush
plate to remove all oil and dirt.
REPLACEMENT OF BRUSHES AND SPRINGS
(1) Brushes that are worn more than
Y 2
the length
of new brushes, or are oil-soaked, should be replaced.
(2) When resoldering the shunt field and solenoid
lead, make a strong low resistance connection using
a high temperature solder and resin flux.
Do not use
acid
or acid core solder.
Do not
break the shunt
field wire units, if so equipped, when removing and
installing the brushes.
(3)
Measure the brush spring tension with a spring
scale hooked under the spring near the end. Pull the
scale on a line parallel to the edge of the brush and
take a reading just as the spring end leaves the brush.
Spring tension should be 32 to 36 ounces. Replace
springs that do not meet specifications.
TEST1 N G ARMATURE
Testing the Armature for Short Circuit
Place the armature in growler and hold a thin steel
blade parallel to the core and just above it, while
slowly rotating the armature in the growler. A shorted
armature will cause the blade to vibrate and be at-
tracted to the core. Replace the armature if shorted.
Testing Armature for Ground
Contact the armature shaft and each of the com-
mutator riser bars with a pair of test lamp test prods.
If the lamp lights,
it
indicates a grounded armature.
Replace a grounded armature.
Testing Commutator Runout,
Refacing and Undercutting
Place the armature in pair
of
"V" blocks and
measure the runout with a dial indicator. Measure
both the shaft and commutator. A bent shaft requires
replacement of the armature. When the commutator
runout exceeds .003 inch, commutator should be re-
faced. Remove only a sufficient amount of metal to
provide a smooth, even surface.
Testing The Field Coils for Ground
(1) Remove the field frame assembly from the
starter.
(2) Carefully drill out the rivet that attaches the
series field coil ground lead and the shunt field coil
lead to the field frame.
(3) Insulate the field coil leads from the field frame.
(4) Test for ground using a 110 volt test lamp.
Touch one probe of the test lamp to the series field
coil lead and the other probe to the field frame. The
lamp should not light. Repeat procedure for the shunt
field coil.
If the lamp lights, it indicates that the field coils are
grounded and require replacement.
REPLACING THE FIELD COILS
A pole shoe impact screwdriver Tool
C-3475
should
be used to remove and install the field coils to p r e
vent damage to the pole shoe screws and for proper
tightening. Pole shoes that are loose and not properly
seated may cause the armature core to rub on the pole
shoes. This will decrease starter efficiency and dam-
age the armature core.
NOTE: Make sure the area between the leads and
starter frame is clean. Peen the new rivet securely
to insure a good electrical contact.
SERVICING THE STARTING MOTOR BUSHINGS
Inspect the armature shaft bearing and pinion shaft
surfaces and bushings for wear. Try the bushings for
wear by inserting the shafts and test for side play.
NOTE: Pre-sized starting motor bushings are avail-
able
as
service bushings. Use Tool
C-3944
to re-
move the old bushings and install the new. No bur-
nishing or reaming
is
required to fit the presized
bushings.
The C-3944 Tool and its adaptors are designed to
service all of the gear reduction motor bushings with
the exception of the end head bushing. The end head
bushing and end head are serviced as an assembly.
Remove and install bushings, Figs. 14 through 16.
SERVICING THE STARTER CLUTCH UNIT
Do not immerse the
starter clutch unit in a clean-
ing solvent. The starter clutch is pre-lubricated
at
the
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